On M320 and T-series platforms, the default behavior is for fabric priority queuing on egress interfaces to match the scheduling priority you assign. High-priority egress traffic is automatically assigned to high-priority fabric queues. Likewise, low-priority egress traffic is automatically assigned to low-priority fabric queues.
For information about overriding automatic fabric priority queuing, see Overriding Fabric Priority Queuing and Associating a Scheduler with a Fabric Priority.